Match the left column with the correct answers from the right column.

Left Column	Right Column
Oxide layer protects from attack by water vapour	(a) $\mathrm{Cu}$
Group $1$ elements of the long periodic table having the least reducing property	(b) $\mathrm{Be}$
When the metals remain exposed to air, green patches develop on its surface	(c) $\mathrm{Al}$
Group $2$ elements of the long periodic table having the least atomic radius	(d) $\mathrm{Li}$

Arrange as directed:

$\mathrm{Na} \left(11\right), \mathrm{K} \left(19\right). \mathrm{Li} \left(3\right), \mathrm{Rb} \left(37\right)$ belonging to Group 1 of the long periodic table according to decreasing order of atomic radius.

(The atomic numbers have been given within first brackets after the symbols of the elements)

Arrange as directed:

$\mathrm{S} \left(16\right), \mathrm{O} \left(8\right), \mathrm{Te} \left(52\right), \mathrm{Se} \left(34\right)$ belonging to Group 16 of the long periodic table according to increasing order of electronegativity. 

(The atomic numbers have been given within first brackets after the symbols of the elements) 

Arrange as directed:

$\mathrm{Ca} \left(20\right), \mathrm{Be} \left(4\right), \mathrm{Sr} \left(38\right), \mathrm{Mg} \left(12\right)$ belonging to Group 2 of the long periodic table according to decreasing order of reducing power. 

(The atomic numbers have been given within first brackets after the symbols of the elements)